William schollhobn



(ModeL) W. SGHOLLHORN.

SHEARS.

NQ 314,729. Patented Mar. 31, 1885.

T Hurra STATE Parent tr es...

WILLIAM SOHOLLHORN, OF NEIV HAVEN, CONNECTICUT, ASSIGNOR TO WVILLIAM SOHOLLHORN 85 00.

SH EARS.

SPECIFICATION forming part of Letters Patent No. 314:.729, dated March 31, 1885.

Application tiled October 20, 1884. (Model.)

To all whom it may concern:

Be it known that I, WILLIAM SOHOLLHORN, of New Haven, in the county of New Haven and State of Connecticut, have invented new Improvements in Shears; and I do hereby declare the following, when taken in connection with accompanying drawings and the letiers ofreference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specifica tion, and represent, in-

Figure 1, a side View; Fig. 2, a longitudinal central section through the pivot.

This invention relates to an improvement in pivoting the blades of shears, adapted principally to the larger class of shears. In the more general construction of such shears, the pivot consistsof a headed screw passing through the two blades, tapped into one, the head taking a bearing upon the other. In some cases it is made in the form of a bolt, 2. large head upon one side to bear upon one blade and a like nut upon the opposite side screwed upon the bolt, and to bear against the opposite blade. In either case, unless the blades work with perfect freedom, the screw is liable to loosen, as in the first instancethat is, theheaded screw-the pivot must hold fast in the blade into which it is screwed, the other blade turning freely on the pivot and against the head, lest through lack of lubricant, or through friction otherwise produced, the blade which turns free so engages the head as to turn the screw. In the second case the difticulty is increased because of one blade working against the head of the pivot, and the other against the not on the other end of the pivot, but either of the blades are liable to so engage the head or nut, as the case may be, by frictional contact sufficient to turn the one from the other and thereby loosen the pivot.

The object of my invention is the construction of a pivot whereby the blades may be properly adjusted, and, once adjusted, held firm without liability of derangement, and also so as to give a large lirm bearing for the blades to turn upon; and the invention consists in i the construction of the pivot and its arrangement in the blades, as more fully hereinafter described, and particularly recited in the claim.

pivot in that position.

A represents the one blade; B, the other, of common construction. 0, the body of the pivot, is screw-threaded, and the one blade A correspondingl y screw-threaded. The-head of the pivot is constructed with a shoulder, a, upon its under side, of a diameter between that of the body 0 of the pivot and the head D. The blade B is bored corresponding to the body of the pivot, and counterbored for the shoulder a, as seen in Fig. 2. The pivot is of sufficient length to extend through the blade A, and so as to receive a nut, E, upon the side opposite the head. This nut serves as a jam-nut to hold the pivot in the blade A at any position to which it may be set. The blades are set together and the pivot introduced, the shoulder a of the head coming to a bearing in the counterbore and the head itself upon a bearing upon the outside of the blade B. It is screwed into the blade A until the two blades are brought into their proper relation to each other, then the nut E is applied to the screw end of the pivot and turned to a firm bearing upon the blade A, as a jam-nut, to lock the The pivot once properly arranged retains that position without possibility of disadjustment in the working of the blades. The shoulder to forms a large bearing upon which the blade Bwill oscillate, and the head D, as well as the under side of the shoulder a, forms a large bearing, against which the side of the blade will work. This construction adds but a trifling cost in the manufacture of the class of shears to which it is adapted, and overcomes serious dilfficulties' in the pivots of such shears as heretofore generally made.

I am aware that a headed rivet having a screw-thread upon its shank has been introduced through one of the blades to bring the head of the rivet upon that blade, and screwed into the other blade, the screwed end portion of the rivet extending through said sec ond blade, with a jam-nut applied thereto, and therefore do not broadly claim such a construction.

I claim- The herein-described improvement in shears,

consisting of the pivot composed of a screw- I00 threaded body, 0, head D on one end, shoulder it directly under the head and of a diameter between that of the body and of the head, i surface of the blade, the opening through the the body of the pivot of a length greater than blade also taking a bearing on the body of the the thickness of the two blades, the one blade pivot, the pivot screwed into the other blade 15 v constructed with an opening for the pivot and extending through that blade, combined 5 and with a counterbore corresponding to the with a nut, E, on said projecting end of the shoulder a beneath the headof the pivot, the pivot and against the surface of theblade op- Other blade having a corresponding opening posite the head, substantially as described. screw-threaded to correspond to the screwthread on the body ofthe pivot, the pivot in- WILLIAM SGHOLLHIORN' 1o troduced through the one blade to bring the Witnesses:

, said shoulder a to a bearing in the counter- ADOLF SOHATZ,

bore'and the head to abearing upon the outer F. J. SoHoLLHoRN. 

